tremor of unknown cause (usually of the hands and head) that develops in older people; often mistaken for Parkinsonism but is not life-threatening and can usually be kept under control
absolutely necessary; vitally necessary
basic and fundamental
of the greatest importance
anything indispensable
defining rights and duties as opposed to giving the rules by which rights and duties are established
a small earthquake
shaking or trembling (usually resulting from weakness or stress or disease)
